Smooth drum rollers, pneumatic tire rollers, and sheep's foot rollers are three types of compaction equipment designed for different material characteristics, with significantly different scopes of application.

1. Smooth Drum Roller

The drum of a smooth drum roller is a smooth metal cylinder, primarily relying on linear pressure for compaction.

Suitable Materials:

• Non-cohesive or low-cohesive materials: Such as sand, gravel, crushed stone, graded crushed stone, etc.

• Asphalt mixtures: Used for the final compaction (finish rolling) of pavement to achieve a smooth and flat surface.

• Old road surfaces: Used for renovation and maintenance work.

Core Features:

• Compacts to a flat surface, effectively eliminating wheel tracks.

• Exerts minimal shearing force on materials, suitable for those requiring particle shape preservation.

• Compaction depth is relatively shallow, mainly acting on the surface layer.

2. Pneumatic Tire Roller

The drum of a pneumatic tire roller consists of multiple inflated tires, providing both vertical pressure and horizontal kneading force during compaction.

Suitable Materials:

• Cohesive materials: Such as cohesive soil, silty soil, etc.

• Asphalt mixtures: A key piece of equipment for asphalt pavement compaction, especially suitable for intermediate and finish rolling stages.

• Backfill soil: Achieves good compaction results on backfill.

Core Features:

• Tire elasticity enables better surface contact with materials, ensuring uniform compaction.

• Kneading action enhances interlocking between material particles, improving density and water damage resistance.

• Causes minimal pavement damage, preserving aggregate angularity.

3. Sheep's Foot Roller

The drum surface of a sheep's foot roller is covered with protruding "sheep's foot"-shaped rams, primarily relying on point pressure for compaction.

Suitable Materials:

• Highly cohesive materials: Such as clay, silty clay, etc.

• Soils with high moisture content: Suitable for compacting cohesive soils with moisture content close to the optimal level.

Core Features:

• Sheep's feet penetrate deep into soil layers, exerting strong compaction on deep soil.

• During compaction, sheep's feet lift surface soil, mixing upper and lower layers for more thorough compaction.

• Results in a relatively rough surface requiring subsequent leveling.

Summary

• Smooth Drum Roller: Suitable for non-cohesive materials and asphalt pavement finish rolling, prioritizing surface smoothness.

• Pneumatic Tire Roller: Suitable for cohesive materials and asphalt pavement intermediate/finish rolling, emphasizing uniform compaction and density.

• Sheep's Foot Roller: Suitable for deep compaction of highly cohesive soils, focusing on compaction depth and uniformity.